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Question: How many M103 timing chains have you personally seen fail?[/QUOTE]
In my 14 years on working on Mb i have seen 2 on the 103 fail and they where at around 250,000 km.Seen about 4 fail on 102 and one of them had 180,000 on the clock. 116 and 117 i repaired about 10 or so of them,one week we had gotten 2 of them in.And i did about 6 timing chain conversions on the early 380's that had the single chain and converted them to double chains.